#include<bits/stdc++.h>
using namespace std;
#define ll long long
const int N=1e6+5;

void in(int &x){
	char c=getchar();
	while (c<'0' || c>'9') c=getchar();
	for (x=0; c>='0' && c<='9'; c=getchar())
		x=x*10+c-'0';
}
string s;
int a[N];
int main(){
	int n, k;
	cin >> n >> k;
	for (int i = 1; i <= n; i++)
	{
		cin >> s[i];
	}
	int u = 1;
	string t = s.substr(u, k);
	for (int i = 1; i <= n - k + 1; i++)
	{
		/*string t = s.substr(i, k);
		cout << t << endl;
		int len = k;
		for (int j = i; j <= i + k - 1; j++)
		{
			s[j] = t[len - 1];
			len--;
		}*/
	}
	//cout << s << endl;
	return 0;
}